Systems and methods for determining the position of an electrical solenoid

a technology of solenoid armature and position determination, which is applied in the direction of instruments, measuring devices, coils, etc., can solve the problems of inability to achieve the position-sensing system, and inability to meet the requirements of product design

Active Publication Date: 2010-08-03
ALCOTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These position feedback devices add complexity and cost to the design where it is desirable to know the position of the solenoid's armature, or the mechanism attached to it.
Further, in some uses of the solenoid, these position-sensing systems may be impractical as they can inhibit or interfere with the operation of mechanisms attached to the solenoid and may become a hindrance to product design.

Method used

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  • Systems and methods for determining the position of an electrical solenoid
  • Systems and methods for determining the position of an electrical solenoid
  • Systems and methods for determining the position of an electrical solenoid

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[0034]The following detailed description illustrates by way of example and not by way of limitation

[0035]Described herein, among other things, are systems and methods which use the solenoid itself to sense the position of the armature within the solenoid, and therefore to determine the position of the solenoid's armature, and or any related devices whose movement is dependent on the armature's movement. Such systems do not require the inclusion of any additional hardware (such as secondary solenoid coils, lasers, or similar devices) interacting with the solenoid to locate the solenoid's armature.

[0036]In an embodiment, there is provided a method for using the change in self-inductance that occurs when the armature moves relative to the solenoid coil to detect the location of the plunger / armature relative to the solenoid coil. Specifically, when an armature is fully within the coil, the inductance of the solenoid is detectably larger than when the armature is extended from the coil....

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Abstract

Provided herein are systems and methods which use the solenoid itself to sense the position of the armature within the solenoid, and therefore to determine the position of the solenoid's armature, and or any related devices whose movement is dependent on the armature's movement. Specifically, a system in which the change in self-induction that occurs when the armature moves relative to the solenoid coil is used to detect the location of the armature.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of U.S. Provisional Patent Application No. 60 / 938,628, filed May 17, 2007, the entire disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to methods for determining the position of the armature of a solenoid. In particular, a method where the back-emf waveform generated by a current pulse applied to the solenoid coil is measured to determine the location of the armature.[0004]2. Description of Related Art[0005]A solenoid is a coil of insulated or enameled wire usually wound on a rod-shaped form, known as the armature, which produces a magnetic field when a current is passed through it. Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets. The term solenoid is often used in reference to a magnet designed to produce a uniform magnetic field in a vo...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01B7/14
CPCG01B7/14
Inventor LUECK, KEITH
Owner ALCOTEK
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